# Relationship history for MSHA mine 1508504

Current hierarchy: **Medlin Sue--Tullie House & Dallas Hutton → Coal Harvesters Inc → No 1 Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Coal Harvesters Inc → No 1 Strip; 1975-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Medlin Sue--Tullie House & Dallas Hutton → No 1 Strip; 1975-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Medlin Sue--Tullie House & Dallas Hutton → Coal Harvesters Inc; 1975-07-01 to current/open; source msha-controller-operator-history